Název: The Weibull Stress Parameters Calibration upon the Toughness Scaling Model between Cracks Having Different Constraint
Autoři: Kozák, Vladislav ; Vlček, Libor
Typ dokumentu: Příspěvky z konference
Konference/Akce: International Conference on STRUCTURAL MECHANICS IN REACTOR TECHNOLOGY /17./., Praha (CZ), 2003-08-17 / 2003-08-22
Rok: 2003
Jazyk: eng
Abstrakt: An extensive investigation has been carried out on the sensitivity parameters determination describing the fracture behaviour of body with crack with respect to the character change of true stress-strain curve with dominant region of Lueders deformation.Consequently,its convenient substitution has been tested.This paper presents the consideration on the change judgement of J-integral and constraint as the base parameters of two-parameters fracture mechanics.The Weibull stress model for cleavage fracture of cast steel requires calibration of two micromechanics parameters (m,ó u).Weibull stress seems to be a parameter for prediction of cleavage failure of cracked bodies and the study is focused on the assessment of the effects of constraint loss on cleavage fracture toughness (Jc).To quantify the effects of constraint variation on the cleavage fracture toughness the form of the toughness-scaling model based on the Weibull stress ó w is investigated.Local material parameters have been calculated arising from Beremin approach and calibration is based on various approaches.Methods are based on weakest link assumption and incremental fracture probability,which depends not only on the maximum principal stress,but also on the equivalent plastic strain.The fracture resistance has been assessed using data from static tests of there point bend specimens.
Klíčová slova: constraint; static tests of the three point bend specimens; Weibull stress
Číslo projektu: CEZ:AV0Z2041904 (CEP), GA106/01/0342 (CEP), GA106/02/0745 (CEP)
Poskytovatel projektu: GA ČR, GA ČR
Zdrojový dokument: International Conference on Structural Mechanics in Reactor Technology /17./

Instituce: Ústav fyziky materiálů AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0074962

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-26574


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav fyziky materiálů
Konferenční materiály > Příspěvky z konference